You have voice notification, animation is not instant and neither is travel time.
If you can't dodge it, you don't have awareness and reflexes needed for some of the most basic dodges.
Don't discriminate; you're forgetting that there are some players that can't hear the voice notification due to hearing problems. Not every player can see the animation clearly (there are several reasons this could be true) and some players may legitimately suffer from slow movements, e.g. poor motor co-ordination or involuntary movements. And yet you claim that anyone should make the top 3 in this game? Very poor post, because you're saying that the game is fine in its discriminatory state.
Rifle nade is a problem due to poor UI design, which limits the progression of differently-abled people, lowers the amount of community participation and allows a cynical observer to view Relic in a particularly critical light (if one were so inclined). Do not let yourself shiver amongst that wintry light.